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my lutino oscars are being too aggeressive!!!

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i am so surprised to see that when i bought them 1 Month ago they were 1'' long and now they are 2.5'' now. There were two tiger oscars also with them in lfs aquarium now after one month i bought there old tankmates from the shop as they were still unsold but now my lutinos were more healthy and they thought the new tankmates as food and began to attack them and beat the hell out of the tigers so i had to return them i thought they were too small for being so aggeresive and at lfs tigers were heavy on lutinos!? can i add any tankmates with them?

It's a bit tough to distinguish the separate points you are trying to get across, But I will give it a shot.

Oscars can be aggressive yes.

Nearly an inch a month is not out of bounds for the first few months growth for Oscars, You are going to need a LARGE tank [Think 150G] to keep two mature Oscars [Or you possibly have more as I re-read your post.]

What size tank are your Oscars in? Please list the fish in the tank.

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.

i have them in 55 g tank and only two small cute lutinos looks like male female pair to me :)) thanks

A 55 is too small for a single Oscar to be kept to maturity, Much less 2 of them. Thinking about your long term plans for them now is a good idea as they are going to be much bigger quite soon and if aggression rears it's ugly head it will go badly and quick.

I don't know how you determined their sex considering Oscars are monomorphic which means there is no way to tell unless you see them in the act and yours are a ways away from being sexually mature. More info on Sexing Oscars here.

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.

Your Oscars aren't being "too aggressive" they are being and doing exactly what Oscars are and do. Fish cannot change what they are just to follow our wishes, so we have to keep them as per their requirements and traits in order to be successful at it. Its when WE try to bend the rules to suit us and what we want to see in our tanks that fish deaths occur.

They may be "cute" now but as they get older, the aggression you have already have had issues with will likely only get worse. You'll want to make up a Plan B for in the future should one of your Oscars start to bully the other - such as a bigger tank or a place to move the bullied fish to - otherwise you may end up with a dead fish - and most likely it will be your favourite one.

How about a pic of the tank? We always like to see tank pics, especially of new members tanks and newly set up tanks.